166643860 has 48 divisors (see below), whose sum is σ = 383337360. Its totient is φ = 60569600.

The previous prime is 166643849. The next prime is 166643863. The reversal of 166643860 is 68346661.

166643860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 34715664 + 131928196 = 5892^2 + 11486^2 .

It is a super-3 number, since 3×166643860³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166643863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1410 + ... + 18310.

It is an arithmetic number, because the mean of its divisors is an integer number (7986195).

Almost surely, 2^166643860 is an apocalyptic number.

166643860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166643860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191668680).

166643860 is an abundant number, since it is smaller than the sum of its proper divisors (216693500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166643860 is a wasteful number, since it uses less digits than its factorization.

166643860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16956 (or 16954 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 166643860 is about 12909.0611587365. The cubic root of 166643860 is about 550.2961050193.

The spelling of 166643860 in words is "one hundred sixty-six million, six hundred forty-three thousand, eight hundred sixty".